Make `mach test-tidy --no-wpt` compatible with Python3
Make `mach test-tidy --no-wpt` compatible with Python3
See also #23607
After this pull request, all python files (except WPT) will be checked for Python3 syntax compatibility.
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adding .isConnected DOM attribute
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is_connected already existed for this concept and just needed to be hooked up to an IDL attribute.
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Took out the special mouseover cancel case
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eventtarget.rs was checking the event type to see if it was a mouseover; now it doesn't. Other special-case events like error and beforeunload go down other code paths entirely, so this one has no special cases left.
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Remove unnecessary thread in filereader, add stream TODO
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I think there are no benefits to queuing the various `FileReadingTask` from a thread, and reading the actual blob bytes are still done on the main-thread. We could try to move the reading off the main-thread(but note the `Blob` is not something you would want to move to another thread "as-is" since it's a `DomObject`), and I think we should just aim for implementing streams and follow the spec instead.
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Percentage `width` are treated as `auto` for the purpose of
min/max-content computation, so they also need to be considered
when testing “wether width is auto”
hidden field named _charset_ now appears in FormData as UTF-8
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HTMLInputElement now has special case logic for putting a hidden field named `_charset_` in an entry set. To support this, the encoding used when constructing a form dataset is now being passed further down the callchain than it was before.
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Add onformdata to GlobalEventHandlers
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1. Adding `onformdata` to GlobalEventHandlers interface and global_event_handlers macro.
2. Deleting related FAIL tests.
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